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  <title>Testing an extension</title>

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  <h2 class="title">Testing an extension</h2>

  <p class="simpara">
   One of the accepted requirements of good programming is testing. PHP provides
   a test harness for unit regression tests, in the form of a script called
   <strong class="command">run-tests.php</strong>.
  </p>

  <p class="simpara">
   Tests for a particular module are stored in the <var class="filename">tests/</var>
   subdirectory of the module&#039;s folder, and have a <var class="filename">.phpt</var>
   extension. For details of the PHPT format, see
   <a href="http://qa.php.net/" class="link external">&raquo;&nbsp;http://qa.php.net/</a>.
  </p>

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